cpu overvoltage error???????????????????????????

cpu overvoltage error???????????????????????????
I keep getting "cpu overvoltage error" upon start-up.

The other error I get is: "The g400D display driver has stopped working normally save your work and reboot the system to restore full functionality. Next time you reboot the machine a dialog will be displayed giving you a chance to upload data about this Microsoft failure.

The 2nd message comes after the number of colors on the screen is lowered and the icons get bigger.

What do I do?


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